The ground I'm hunting is not bad, per se, just varies a lot in homesites or old camps. It seems I get pretty good depth with either frequency. I'm just wondering if iron and non-ferrous would separate better with 18khz? I don't have the 9" HF coil, but would pick it up if it helps with hearing the difference between brass and iron in a scattering of nails. I have a 10.5 DD, 7.5 and it's a great coil, but I suspect that the concentric might be better in dense iron.
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7.5 vs 18khz for iron and non-ferrous separation
- Thread starter Canewrap
- Start date
Actually, all of the opposites are true. An LF coil will be a more dramatic distinctive difference between iron and nonferrous objects. And a concentric coil will be of much less use at iron infested sites.
If you would like a more descriptive explanation, I can give you one when I get back to my desktop.
If you would like a more descriptive explanation, I can give you one when I get back to my desktop.
surfchunker
New member
concentric coils throw a bowl shaped signal down into the ground and you will have a lot more stuff under your coil at once, DD coils throw more of a cateye shaped signal down into the ground and you will have less targets under your coil at once meaning better separation between good and bad targets as it's seeing less of an area
Ok then, the 10.5 DD I'm using is better for my open field relic hunting then. I just thought that the bottom of the cone under a 9" concentric would be a smaller area (less potential targets at once) than the 10.5" DD coil's wiper blade that goes down to the same depth. Would the 15" WOT Coil be more prone to having trouble with the iron then, when it's a bunch of scattered nails?
I actually really like the 15" All Terrain 3kHz coil for general field hunting, and then switch to the 3kHz 6" Digger when I get into the real heavy debris.
3kHz gets a little better punch into the ground, really distinguishes higher conductors from low conductors, and the big coil sees DEEP. It's separation is really good too. I've hit a field site where there had been a home, so lots of nails in an area, and when I went back with the 6" coil I only found one coin that the 15" had missed due to masking.
3kHz gets a little better punch into the ground, really distinguishes higher conductors from low conductors, and the big coil sees DEEP. It's separation is really good too. I've hit a field site where there had been a home, so lots of nails in an area, and when I went back with the 6" coil I only found one coin that the 15" had missed due to masking.
surfchunker
New member
the concentric will be a smaller spot at the very bottom of it's detection field but the close to the top the bigger it is so that deep good targets get masked by the shallow ones